Chemistry Thermodynamics and Thermochemistry JEE Advanced Previous Years Question Single Correct MCQ
Published on: August 14, 2026

For an ideal gas, consider only P-V work in going from an initial state X to the final state Z. The final state Z can be reached by either of the two paths shown in the figure. Which of the following choice(s) is (are) correct? [take Δ S as change in entropy and w as work done].

A
Δ S x → z = Δ S x → y + Δ S y → z
B
w x → z = w x → y + w y → z
C
w x → y → z = w x → y
D
Δ S x → y → z = Δ S x → y

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The correct answer is:
CHECK THE SOLUTION.

(a,c)

Δ S x → z = Δ S x–y + Δ S y → z (Correct)

W x → y = W x–y + W y → z (Incorrect)

W x → y → z = W x–y (Correct)

Δ S x → y → z = Δ S x–y (Incorrect)

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